Pier Foundation
EBS Geostructural:
https://www.ebsgeo.com/helical-piles
They use collars on the piers to create voids for addition of grout and centralizer disks to keep the pier centered in the grout column. Video using 2" x 2" steel piers: https://www.youtube.com/watch?v=plITAEWb5v8
Fortress Foundation in Little Elm, TX appears to use the above piers for new construction:
https://fortressfoundationsystems.com/
Another company explaining pier installation on soil that varies in density. They install them to 5900 ft lb torque:
https://www.youtube.com/watch?v=us6eXEHvahs
PierTech Systems:
Some use grout for loose soils (cement, water, fiber, expansive material):
https://www.youtube.com/watch?v=fvCqdqt--QQ
This video is about a telescoping drive head:
https://www.youtube.com/watch?v=_GZ5rQ4xxEg
Installation torque is critical and I see two methods of measuring it:
strain gauge
differential pressure in hydraulic lines
In this video, they say the helical pier was developed by an Irish man for a lighthouse:
https://www.youtube.com/watch?v=SQdYbhOVm9Y
Chinese company offering piers:
